Probably too soon to tell, but my guess (and I don't have this breed) would be pullet; I think that by 4 weeks, typically single comb varieties combs are looking much more red if it's a cockerel. But, don't hold me to that!
Hmm.... there seems to be more white in the barring of the chick than in the momma. Generally, the chicks with more white in the barring are male. Hard to tell without hatchmates to compare to, though.
Would you say there white was equal to the black? That would probably be male...